Then again, even that doesn't worry me too much, since I almost never read a book twice anyway. I think the only book I've read more than once is the hitchhiker's guide to the galaxy.
For now, in my experience, ebooks have always been cheaper than print versions of the same work. I suspect that if one calculated the resell value of a printed book, the prices would come out about equal. Which is why I chose eBooks for their convenience.
There are some books I absolutely buy (and I have a rather large library myself, entirely physical), but there are many cases where borrowing makes more sense.
I am a creature of comfort after all!
I use bookmarks, often the paper receipt from the purchase of the book itself.
But it's a great option if you have a modern device.
As you should, but my comment takes "book" to mean the cultural object, encompassing non-physical (e-)books.
This sounds unnecessarily reductive. By "own" I would mean that I can re-read the book again and again and again as many times as I want as long as I take good care of the book and prevent it from disintegrating.
But the DRM e-books can't be used like that. That was their point.